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RISS 인기검색어
- 검색키워드
- 저자 : Simon A. Rogers (검색결과 3 건)
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A sequence of physical processes quantified in LAOS by continuous local measures
Ching-Wei Lee,Simon A. Rogers 한국유변학회 2017 Korea-Australia rheology journal Vol.29 No.4
The response to large amplitude oscillatory shear of a soft colloidal glass formed by a suspension of multiarm star polymers is investigated by means of well-defined continuous local measures. The local measures provide information regarding the transient elastic and viscous response of the material, as well as elastic extension via a shifting equilibrium position. It is shown that even when the amplitude of the strain is very large, cages reform and break twice per period and exhibit maximum elasticity around the point of zero stress. It is also shown that around the point of zero stress, the cages are extended by a nearly constant amount of approximately 5% at 1 rad/s and 7% at 10 rad/s, even when the total strain is as large as 420%. The results of this study provide a blueprint for a generic approach to elucidating the complex dynamics exhibited by soft materials under flow.
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Nanoscale, Electrified Liquid Jets for High-Resolution Printing of Charge
Park, Jang-Ung,Lee, Sangkyu,Unarunotai, Sakulsuk,Sun, Yugang,Dunham, Simon,Song, Taeseup,Ferreira, Placid M.,Alleyene, Andrew G.,Paik, Ungyu,Rogers, John A. American Chemical Society 2010 NANO LETTERS Vol.10 No.2
<P>Nearly all research in micro- and nanofabrication focuses on the formation of solid structures of materials that perform some mechanical, electrical, optical, or related function. Fabricating patterns of charges, by contrast, is a much less well explored area that is of separate and growing interesting because the associated electric fields can be exploited to control the behavior of nanoscale electronic and mechanical devices, guide the assembly of nanomaterials, or modulate the properties of biological systems. This paper describes a versatile technique that uses fine, electrified liquid jets formed by electrohydrodynamics at micro- and nanoscale nozzles to print complex patterns of both positive and negative charges, with resolution that can extend into the submicrometer and nanometer regime. The reported results establish the basic aspects of this process and demonstrate the capabilities through printed patterns with diverse geometries and charge configurations in a variety of liquid inks, including suspensions of nanoparticles and nanowires. The use of printed charge to control the properties of silicon nanomembrane transistors provides an application example.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2010/nalefd.2010.10.issue-2/nl903495f/production/images/medium/nl-2009-03495f_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl903495f'>ACS Electronic Supporting Info</A></P>
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Fundamental effects in nanoscale thermocapillary flow
Hun Jin, Sung,Song, Jizhou,Uk Chung, Ha,Zhang, Chenxi,Dunham, Simon N.,Xie, Xu,Du, Frank,Kim, Tae-il,Lee, Jong-Ho,Huang, Yonggang,Rogers, John A. American Institute of Physics 2014 Journal of Applied Physics Vol.115 No.5
When implemented on the nanoscale, material flows driven by gradients in temperature, sometimes known as thermocapillary flows, can be exploited for various purposes, including nanopatterning, device fabrication, and purification of arrays of single walled carbon nanotubes (SWNTs). Systematic experimental and theoretical studies on thermocapillary flow in thin polymer films driven by heating in individual metallic SWNT over a range of conditions and molecular weights reveal the underlying physics of this process. The findings suggest that the zero-shear viscosity is a critical parameter that dominates the dependence on substrate temperature and heating power. The experimentally validated analytical models in this study allow assessment of sensitivity to other parameters, such as the temperature coefficient of surface tension, the thermal interface conductance, and the characteristic length scale of the heated zone. (c) 2014 AIP Publishing LLC.
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